#include<stdio.h>
void swap(int a, int b)
{
	int temp = 0;
	temp = a;
	a = b;
	b = temp;
}
int main()
{
	int a = 3, b = 4;
	printf("交换前a=%d,b=%d\n", a, b);
	swap(a, b);
	printf("交换后a=%d,b=%d\n", a, b);
	return 0;
}